Vulkan API not working through Snap package

[LiamDawe]

Describe the bug Tried out the 4.0 Beta, switched to Vulkan in the options and then it doesn't launch.

Terminal output:

[liam@liam-pc ~]$ warzone2100 error |12:43:36: [_initialize:2806] pickPhysicalDevice failed: vk::Instance::enumeratePhysicalDevices: ErrorInitializationFailed fatal |12:43:36: [shouldResetGfxBackendPrompt:1962] Failed to display message box fatal |12:43:36: [wzMainScreenSetup:2515] gfx_api::context::get().initialize failed for backend: vulkan

Your System:

• OS: Arch Linux
• Game version: 4.0.0-beta1

I tested also building via source, that works fine. So it's something specific to the Snap.

[past-due]

Looks like you are hitting two issues:

• There appears to be a weird bug affecting SDL_ShowMessageBox and ArchLinux (there's a reference here: https://www.reddit.com/r/archlinux/comments/j9s22g/sdl2_complains_about_lacking_a_message_system/) (You should receive a message box telling you that initializing Vulkan failed and giving you an easy option to reset back to OpenGL.)
• Vulkan support with the Snap should be considered a work-in-progress, and may not support certain graphics cards (particularly: Nvidia) at this time. (Snap itself doesn't yet have automatic configuration of Vulkan support so we're trying to manually handle it in the Snap config, but that requires specific configuration for different graphics hardware.) What graphics card are you using? (Ideally this will be properly resolved when Snap adds the appropriate automatic configuration of Vulkan support.)

You can manually reset the graphics backend using the following command-line option: warzone2100 --gfxbackend=opengl